Malicious PDF — malware analysis report

Static analysis result for SHA-256 7943dcf5d2e9809e…

MALICIOUS

PDF

74.5 KB Created: 2021-04-25 15:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a0b6a250875572b0345196ce2c4c4d3f SHA-1: 122172972c8ae578e813cf3caa39c8182fc83918 SHA-256: 7943dcf5d2e9809e7ce548dc77e7c0d2cbc919932142f334b8565c697fa7e87f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics indicate the PDF contains numerous external links, many pointing to unknown or potentially malicious domains, and is structured as a link farm. Although no scripts were explicitly extracted, the PDF structure and link farm characteristics suggest it's designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://aboss.by/sites/default/files/webform/80384466065.pdf In PDF document text
    • https://www.jsif.org/sites/default/files/webform/54250685962.pdfIn PDF document text
    • http://www.friendlycc.com/sites/default/files/webform/tojatovovezugunubi.pdfIn PDF document text
    • http://seiary.com/sites/default/files/webform/rec/11252708720.pdfIn PDF document text
    • https://www.woonsocketri.org/system/temporary/webform/51053607868.pdfIn PDF document text
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/22559513310.pdfIn PDF document text
    • https://www.woonsocketri.org/system/temporary/webform/viwubamonutimujogigifowi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=manual+del+conductor+comercial+de+pennsylvaniaPDF link annotation
    • https://lib.asu.edu/system/files/webform/dilitopuwivane.pdfIn PDF document text
    • https://www.vub.be/sites/vub/files/webform/16824703900.pdfIn PDF document text
    • https://www.vub.be/sites/vub/files/webform/pagilavamuvawasaxega.pdfIn PDF document text
    • https://lib.asu.edu/system/files/webform/bidemuf.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAF 5388 bytes
SHA-256: 73543de199f230aefcfa7495566c759a7535ac16e621b7a93d1ad2a5f684151d
font_01_sfnt_off0000e000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE000 12300 bytes
SHA-256: 1f11b7e0ddf787c76ba61202d67c30862601d2f0e5bac1070fd7c818d36ef9e9
font_02_sfnt_off000107e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E9 16144 bytes
SHA-256: 18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b

Open this report in the interactive analyzer, or submit your own file for analysis.